JP3968123B2 - Spray gun - Google Patents

Description

[0001]
(Technical field)
The present invention relates to a spray gun, in particular, a gun body, a nozzle assembly provided on the gun body, a compressed air supply path for controlling compressed air supplied to the nozzle assembly together with a valve assembly, and supply of spray material. The present invention relates to a spray gun comprising a regulator for setting a quantity, a control element for controlling the valve assembly and the regulator, and a pressure measuring device for detecting and displaying a pressure in a compressed air supply path.
[0002]
(Background technology)
Of particular importance when dealing with spray guns is to adjust the spray pressure to achieve optimal atomization so that optimal work results are obtained at a suitable work speed and excellent work efficiency. If the spray pressure is too low, for example, uneven color of the base coating, an increase in the orange peel structure of the transparent coating and the colorless lacquer, a reduction in the working speed, and in some cases a reduction in the flow width will occur. Conversely, if the spray pressure is too high, a large amount of the spray material is atomized, which leads to a great waste of waste and a demand for more pressure than necessary. Also, during the spraying process, it is necessary to monitor the available pressure to know the possibility of a pressure drop due to an increased load in the compressed air network, or a pressure increase due to activation of the source.
[0003]
Often, a pressure regulating valve with a pressure gauge is connected to the inlet of the spray gun to regulate and monitor the spray pressure. The spray pressure that can be adjusted with the adjustment knob on the pressure adjustment valve can be displayed on the pressure gauge. However, if a pressure control valve with a pressure gauge is attached to the air intake of the paint spray gun, the entire length of the spray gun becomes longer and handling becomes difficult. Moreover, since the direction of the internal path changes, the pressure gauge or the pressure regulating valve causes a pressure drop. Normally, the pressure regulating valve, which is screwed, must be removed when cleaning the spray gun in a water rinsing device or tub, which can be found in the coating residue, paint residue, or solvent meter. This is because there is a possibility that the display accuracy of the pressure gauge may be impaired due to the approach to. Therefore, it is necessary to remove the pressure regulating valve with a pressure gauge every time in the cleaning process, and considerable labor is required for this work.
[0004]
Paint spray guns are also well known, but this paint spray gun has a connection for attaching a conventional pressure gauge to the underside of the handle. A typical pressure gauge is usually provided with a semicircular or spiral curved steel pipe spring as a pressure sensor, and a change in the shape of the steel pipe spring caused by the pressure is indicated by a pointer on the corresponding instrument scale. The steel pipe spring and the display device are housed in a special housing. Even in this configuration, the attached pressure gauge makes it difficult to handle the spray gun. Also, since the pressure gauge must be removed when cleaning the paint spray gun, the spray gun and pressure gauge must be connected using a relatively expensive coupling system or connection system.
[0005]
A method of attaching a conventional pressure gauge to the side surface of the gun body has also been proposed, but in this case as well, the pressure gauge protruding to one side adversely affects the handling of the spray gun. Also, such a spray gun must be handled with particular care so as not to damage the pressure gauge mounted on one side when the spray gun is placed.
[0006]
(Disclosure of the Invention)
Accordingly, an object of the present invention is to provide a spray gun with a pressure measuring device that is easy to handle regardless of the contents.
[0007]
This problem is solved by a spray gun comprising the features of claim 1 of the present invention.
[0008]
In the spray gun according to the present invention, a pressure sensor of an integrated pressure measuring device is also incorporated in the gun body. Thereby, the protection mechanism of the pressure sensor inside the paint spray gun can be realized with a very small configuration. The pressure sensor is connected to the compressed air supply path by a capillary tube. This capillary can cause the solvent used to clean the spray gun, coating residue, and paint residue to penetrate the pressure sensor area and adversely affect or interfere with normal pressure measurements. To prevent that. Since the paint spray gun according to the present invention can be cleaned without disassembling the measuring device, there is no risk of damaging the pressure sensor that is inherently damaged.
[0009]
Also included in the handle of a spray gun, for example, including additional circuitry and display for signal conversion and evaluation. In this method, the entire measuring device is mounted on the gun body, and the measuring device is optimally protected from damage within the gun body.
[0010]
The display device may be either an analog display or a digital display, but this display device can be arranged at the rear end of the gun body so that the display can be read from behind. This arrangement has the advantage that pressure can always be displayed in the visible region during spraying.
[0011]
The best mode and preferred refinements of the invention are indicated in the dependent claims.
[0012]
In one embodiment, a capillary tube can be disposed in the coupling path. The connection path is located between the air supply path in the gun inlet region upstream of the valve assembly and the pressure sensing section. With this configuration, the pressure at the gun inlet can be detected. The capillaries can also be placed in a connection path between the pressure sensing section and the downstream portion of the valve device. In this arrangement method, the air pressure used for spraying, which is adjusted by the regulator of the valve assembly, can be detected and displayed.
[0013]
(Best Mode for Carrying Out the Invention)
The spray gun shown in FIG. 1 includes a gun body 1 having a handle 2 and an upper layer portion 3, and a hanger hook 4 is formed on the upper layer portion 3. The through hole 5 extending in the front-rear direction has a plurality of steps in which the nozzle pin can move, and penetrates the upper layer portion 3. The through-hole 5 is formed as a wide receptacle 7 at the foremost portion, and a supply hole 8 for mounting a paint container (not shown) is opened obliquely toward the receptacle 7. A nozzle assembly 9 is attached to the front end of the through hole 5. The coating nozzle 10 of this nozzle assembly can be fixed to the upper layer portion 3 of the gun body 1 using screws. The coating nozzle 10 is provided with a nozzle hole 11 at the foremost part, and the nozzle hole 11 can be moved in the axial direction by the control lever 12 and functions together with the foremost part of the nozzle pin 6 for feeding the tip of the gun. Supplies paints and coatings in a controllable manner. When the control lever 12 is coupled to the nozzle pin 6 and the control lever 12 is pulled backward, the nozzle pin 6 is pushed back against the force of the spring 13 and the nozzle hole 11 is opened to release the paint. The pressurizing pressure of the compression spring 13 and the operating range of the nozzle pin 6 can be adjusted by using a set screw 14 provided at the rear end of the through hole 5 and a corresponding chrysanthemum nut 15. The control lever 12 can also be used to control the valve assembly 17 shown in FIG. This control is performed via a rod 16 having a rear regulator 18 that controls the compressed air supplied to the nozzle assembly 9.
[0014]
The compressed air supply path in the gun housing 1 includes a section 19 upstream of the valve assembly 17 and a section 20 shown in FIG. 4 downstream of the valve assembly 17, and these sections guide the compressed air to the air conduction system 21. To do. The compressed air is further guided from there to an annular groove 22 around the nozzle hole 11. This compressed air creates a vacuum in the area of the nozzle hole 11. The paint is sucked out of the nozzle hole 11 by the generated vacuum state, and at this time, the paint is atomized by the compressed air forming an annular flow. A so-called air horn hole 23 is provided in the protruding horn 24 of the air retainer 25 surrounding the coating nozzle 10, and the compressed air forming an annular flow can be output as a flat flow through the air horn hole 23. . The air retainer 25 can be fixed to the upper layer portion 3 of the housing 1 using a coupling nut 26.
[0015]
The nozzle assembly 9 and its structure are already well known. An available nozzle assembly is disclosed, for example, in EP 0710506 (EP 0710 506 A1). For details of the nozzle assembly, see the aforementioned patent publication. The disclosure of the patent is the subject of this application.
[0016]
The spray gun includes a pressure measuring device 27 integrated with the handle 2 of the gun body 1. The pressure measuring device 27 basically includes a pressure sensor 28, a circuit array 29, and a display device 30. As can be seen from FIG. 2, for example, the pressure sensor 28 configured as a piezoelectric pressure sensor is inserted into the blind hole 31 on the side surface of the handle 2. The blind hole 31 defines a pressure sensing chamber 33 that includes an upper measurement surface 32. The pressure sensor 28 is connected to the circuit arrangement 29 by an electrical connection 34. This circuit arrangement basically consists of a circuit board with corresponding circuits arranged in corresponding receptacles 35 in the gun handle 2. For example, a display device 30 configured as an LCD display is provided on the circuit array 29 to display the pressure detected by the pressure sensor 28. The circuit array 29 and the display device 30 are held by the cover plate 38 through the intermediate element 36. The cover plate 38 is mounted on the gun handle 2 together with the display window 37. Also, the cover plate fitted into the side surface of the gun handle 2 is screwed through a sealing element 39 that seals the gun handle 2 and prevents mixing of fluid and contaminants. On the side surface of the handle 2 corresponding to the opposite side of the display device 30, there is a compartment 41 for the battery 42. The battery 42 is a power source for the evaluation circuit and the display device. This compartment can be covered with a cover 40.
[0017]
As shown in the figure, particularly in FIG. 3, the pressure sensing chamber 33 communicates with a section 19 of the compressed air supply path in the gun inlet region via a connecting path 44 including a capillary tube 43. This compartment is located upstream of the valve assembly. The capillary is configured as a hole with a diameter of 0.5 to 1.8 millimeters. In order to realize this configuration, the connection path 44 is formed as a horizontal connection hole and is configured to be blocked from the outside by using the balls 45. The capillary 43 prevents the cleaning agent or solvent used when cleaning the spray gun and the coating agent particles scattered in the air from entering the pressure detection chamber to adversely affect the measurement accuracy or disturb the measurement itself.
[0018]
4 to 6 differs from the above-described configuration in that the capillaries 43 are provided in the connection path 46 located between the compressed air supply path section 20 and the pressure detection chamber 33 disposed downstream of the valve assembly 17. Deploy. In this method, the air pressure used for spraying set by the regulator 18 can be detected and displayed. FIG. 5 shows another regulator 47. The regulator 47 includes a horizontal rotation knob 48 that adjusts the compressed air supplied to the hole 23. Other embodiments of the spray gun correspond to the previously described embodiments shown in FIGS.
[0019]
In the embodiment shown in FIGS. 7 to 9, the pressure sensor 28 is disposed in an independent receptacle 49 located above the compartment 41 of the circuit arrangement 29, the display device 30, and the battery 42. Regarding the other points, the spray gun according to the present embodiment has basically the same configuration as the above-described embodiment described with reference to FIGS. 4 to 6. However, in the present embodiment, the operating pressure set by the regulator 18 can be detected and displayed.
[0020]
10 and 11 show still another embodiment. The gun body 1 having this configuration includes a rear end piece 50. The end piece 50 may be configured integrally with the upper layer portion 3 or may be configured as an end component that can be mounted by, for example, screwing or fitting. Termination top 50 includes a receptacle 51 having a pressure sensing chamber 52 for pressure sensor 28. The pressure sensing chamber 52 is connected to a compressed air supply path upstream of the valve assembly 17 by a capillary 53 disposed in the axial direction of the terminal end. The terminal top 50 is provided with a digital display device 54 including a display unit 55 so that the display content can be confirmed from behind the spray gun even during work.
[0021]
The present invention is not limited to the above-described embodiment described with reference to the drawings. For example, other suitable pressure probes or pressure sensors may be used instead of the piezoelectric pressure sensor. Also, the pressure sensor can be installed at other suitable locations in the gun body.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a side surface of a spray gun according to a first embodiment.
FIG. 2 is an enlarged view of a cross section taken along line CC in FIG. 1;
FIG. 3 is an enlarged view of a cross section taken along line BB in FIG. 1;
FIG. 4 is a partial cross-sectional view of a side surface of a spray gun according to a second embodiment.
5 is an enlarged view of a cross section taken along line CC in FIG. 4;
6 is an enlarged view of a cross section taken along line BB in FIG. 4;
FIG. 7 is a partial cross-sectional view of a side surface of a spray gun according to a third embodiment.
8 is an enlarged view of a cross section taken along line CC in FIG.
FIG. 9 is an enlarged view of a cross section taken along line BB in FIG. 7;
FIG. 10 is a partial cross-sectional view of a side surface of a spray gun according to a fourth embodiment.
11 is a rear view of the spray gun of FIG.

Claims (5)

The gun body (1),
A nozzle assembly (9) provided on the gun body (1);
A compressed air supply path (19, 20) disposed in the gun body (1) together with the valve assembly (17) to control the compressed air supplied to the nozzle assembly (9);
Regulators (6, 13) for setting the supply amount of the spray material;
A control element (12) for controlling the valve assembly (17) and the regulator (6, 13);
Wherein is integrated with the gun body (1), the pressure in the compressed air supply path (19, 20) and a pressure measuring device for displaying sensed electrically to (27), said pressure measuring device (27) A spray gun including a pressure sensor (28) and a display device (30) for displaying pressure based on an electrical output from the pressure sensor (28) ,
The display device (30) is attached to the handle (2) of the gun body (1 ) and covered with a cover plate (38) having a display window (37),
The cover plate (38) is fitted on the side of the handle (2),
The pressure sensor (28) is inserted into a pressure sensing chamber (33) in the handle (2) of the gun body (1),
A capillary tube (43) is provided between the compressed air supply path (19, 20) and the pressure detection chamber (33) for the pressure sensor (28), and the capillary tube (43) is used for cleaning a spray gun. Configured as a hole having a diameter of 0.5 to 1.8 mm so as to prevent the cleaning agent or solvent to be dispersed and the coating agent particles scattered in the air from entering the pressure detection chamber (33) ;
A spray gun characterized by 2. The spray gun according to claim 1, wherein a capillary is provided in the connecting path (46) between the pressure sensing chamber (33) and the compartment (20) of the compressed air supply path (19, 20) downstream of the valve assembly (17). (43) The spray gun characterized by providing. A spray gun according to claim 1 , wherein the capillary is connected to the connecting path (44) between the pressure detection chamber (33) and the compartment (19) of the compressed air supply path (19, 20) upstream of the valve assembly (17). (43) The spray gun characterized by providing. A spray gun according to any one of claims 1乃optimum 3, a spray gun, characterized in that it comprises a pressure measuring device (27) circuit arrangement disposed gun body (1) is (29). A spray gun according to any one of claims 1乃optimum 4, spray gun which is characterized in the provision compartment (41) to the gun body (1) for a battery (42).

Images